ISO 9453:2006 specifies the requirements for chemical composition for the following families of soft solder alloys:
tin-lead, with and without antimony, bismuth, cadmium, copper, and silver;
tin-antimony;
tin-bismuth;
tin-copper, with and without silver;
tin-indium, with and without silver and bismuth;
tin-silver, with and without copper and bismuth;
tin-zinc, with and without bismuth.
ISO 9453:2006 also includes an indication of the forms generally available.